NASCAR, racing world reacts to Kyle Busch's shocking death at 41: 'Cannot comprehend this news'

The NASCAR world was stunned on Thursday when Kyle Busch, one of the sport's all-time greats, died suddenly at the age of 41.

Busch, 41, was hospitalized Thursday because of an undisclosed but "severe illness," according to a statement put out by the Busch family. NASCAR, the Busch family and Richard Childress Racing announced the death Thursday evening, but did not offer a cause of death.

When news of Busch's death broke, fellow NASCAR drivers mourned their lost competitor.

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